<div class="doc-item" id="doc-582"><h2 class="doc-item-name">alter<span class="namespace">(clojure.core)</span></h2><ul class="var-arglists"><li>(<span class="var-name">alter</span> ref fun &amp; args)</li></ul><div class="var-docstring"><p>Must be called in a transaction. Sets the in-transaction-value of
  ref to:</p><p>(apply fun in-transaction-value-of-ref args)</p><p>and returns the in-transaction-value of ref.</p></div><div class="var-source"><pre>; clojure/core.clj:1368
(defn alter
  [#^clojure.lang.Ref ref fun &amp; args]
    (. ref (alter fun args)))</pre></div><div class="license"><p>Copyright (c) Rich Hickey. All rights reserved.</p><p>The use and distribution terms for this software are covered by the <a href="http://opensource.org/licenses/eclipse-1.0.php">Eclipse Public License 1.0</a>, which can be found in the file
          epl-v10.html at the root of this distribution. By using this software
          in any fashion, you are agreeing to be bound by the terms of this
          license. You must not remove this notice, or any other, from this
          software.</p></div></div>